NAD T513 power supply load !

[guizmo1967]

Hello,

I tried to repair a NAD T513 DVD/CD player that was showing "no disk error". Replacing the laser unit did not solved the problem.

I noticed that the LA6560 Five-Channel Driver was getting really hot but did not bother to replaced it so I gave the unit to a recycle center.

I kept the power supply for learning purpose but it is not working once removed from the player, I think it's because there is no load !

There is only one connector (15 pins)

1   VF+
2   VF-
3   -27VA
4   5.2VA
5   PWR_CTL
6   D.GND
7   5V
8   12V
9   A.GND
10  3.3V(1.8V)
11  3.3V
12  3.3V_M
13  D.GND
14  8V
15  M.GND

My questions are:

Do every power rail needs a load ? If so, which one and what king of load, just a resistor ?

What would you do to make it work outside the player ?

Thank you !

[wasedadoc]

I would try loading at least the supply that is monitored in the feedback loop.  Finding a schematic is probably the easiest way of determining that.